PICTURES: Presidents Obama and Castro meet

OBAMA - CASTRO

CHIP SOMODEVILLA / GETTY IMAGES

Cuban President Raul Castro (L) greets U.S. first lady Michelle Obama and U.S. President Barack Obama (R) before a state dinner at the Palace of the Revolution March 21, 2016 in Havana, Cuba. March 21, 2016 in Havana, Cuba. This is the first time a sitting U.S. president has visited Cuba in 88 years.

Cuban President Raul Castro (L) greets U.S. first lady Michelle Obama and U.S. President Barack Obama (R) before a state dinner at the Palace of the Revolution March 21, 2016 in Havana, Cuba. March 21, 2016 in Havana, Cuba. This is the first time a sitting U.S. president has visited Cuba in 88 years. (CHIP SOMODEVILLA / GETTY IMAGES)

U.S. first lady Michelle Obama and U.S. President Barack Obama arrive for a state dinner at the Palace of the Revolution March 21, 2016 in Havana, Cuba. This is the first time a sitting U.S. president has visited Cuba in 88 years.

U.S. first lady Michelle Obama and U.S. President Barack Obama arrive for a state dinner at the Palace of the Revolution March 21, 2016 in Havana, Cuba. This is the first time a sitting U.S. president has visited Cuba in 88 years. (CHIP SOMODEVILLA / GETTY IMAGES)